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抑制变压器直流偏磁的串接电阻措施
引用本文:赵杰,黎小林,吕金壮,曾嵘,牛犇.抑制变压器直流偏磁的串接电阻措施[J].电力系统自动化,2006,30(12):88-91.
作者姓名:赵杰  黎小林  吕金壮  曾嵘  牛犇
作者单位:1. 南方电网技术研究中心,广东省,广州市,510623
2. 清华大学电机系,北京市,100084
摘    要:高压直流输电系统单极大地回线方式运行时,巨大的入地电流将会使接地板附近的变电站主变压器产生直流偏磁,对交流系统造成不利影响.文中论证了在变压器中性点串接电阻器限制地中直流流入的可行性,并从抑制中性点直流与过电压效果和继电保护角度分析及校核了中性点电阻器对系统造成的影响.研究表明,这是一种简单有效的抑制变压器中性点直流电流的措施.

关 键 词:高压直流输电  直流偏磁  中性点串联电阻器  过电压  继电保护
收稿时间:2005-10-07
修稿时间:2005-10-072006-01-17

Applying Series Resistor to Restrain Power Transformer DC Biasing
ZHAO Jie,LI Xiaolin,L Jinzhuang,Jinzhuang,ZENG Rong,NIU Ben.Applying Series Resistor to Restrain Power Transformer DC Biasing[J].Automation of Electric Power Systems,2006,30(12):88-91.
Authors:ZHAO Jie  LI Xiaolin  L Jinzhuang  Jinzhuang  ZENG Rong  NIU Ben
Institution:1. CSG Technology Research Center, Guangzhou 510623, China; 2. Tsinghua University, Beijing 100084, China
Abstract:The enormous ground return current caused by HVDC (high voltage direct current) system's mono-pole ground return operation mode will result in the main transformer DC biasing at the substations near the ground electrode, thus it has disadvantageous effect on AC (alternative current) system. This paper introduces the measure by using a series neutral resistor to restrain the DC ground current into the transformer. Also, the effects of the application on restraining the neutral current, AC system over-voltage and relay protection are analyzed and checked out. The measure is then proved effective to restrain power transformer DC biasing with analysis result.
Keywords:HVDC transmission  DC biasing  series neutral resistor  over-voltage  relay protection
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